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<title>Using the GNU Compiler Collection (GCC): MeP Options</title>

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<a name="MeP-Options"></a>
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<hr>
<a name="MeP-Options-1"></a>
<h4 class="subsection">3.18.24 MeP Options</h4>
<a name="index-MeP-options"></a>

<dl compact="compact">
<dt><code>-mabsdiff</code></dt>
<dd><a name="index-mabsdiff"></a>
<p>Enables the <code>abs</code> instruction, which is the absolute difference
between two registers.
</p>
</dd>
<dt><code>-mall-opts</code></dt>
<dd><a name="index-mall_002dopts"></a>
<p>Enables all the optional instructions&mdash;average, multiply, divide, bit
operations, leading zero, absolute difference, min/max, clip, and
saturation.
</p>

</dd>
<dt><code>-maverage</code></dt>
<dd><a name="index-maverage"></a>
<p>Enables the <code>ave</code> instruction, which computes the average of two
registers.
</p>
</dd>
<dt><code>-mbased=<var>n</var></code></dt>
<dd><a name="index-mbased_003d"></a>
<p>Variables of size <var>n</var> bytes or smaller are placed in the
<code>.based</code> section by default.  Based variables use the <code>$tp</code>
register as a base register, and there is a 128-byte limit to the
<code>.based</code> section.
</p>
</dd>
<dt><code>-mbitops</code></dt>
<dd><a name="index-mbitops"></a>
<p>Enables the bit operation instructions&mdash;bit test (<code>btstm</code>), set
(<code>bsetm</code>), clear (<code>bclrm</code>), invert (<code>bnotm</code>), and
test-and-set (<code>tas</code>).
</p>
</dd>
<dt><code>-mc=<var>name</var></code></dt>
<dd><a name="index-mc_003d"></a>
<p>Selects which section constant data is placed in.  <var>name</var> may
be &lsquo;<samp>tiny</samp>&rsquo;, &lsquo;<samp>near</samp>&rsquo;, or &lsquo;<samp>far</samp>&rsquo;.
</p>
</dd>
<dt><code>-mclip</code></dt>
<dd><a name="index-mclip"></a>
<p>Enables the <code>clip</code> instruction.  Note that <samp>-mclip</samp> is not
useful unless you also provide <samp>-mminmax</samp>.
</p>
</dd>
<dt><code>-mconfig=<var>name</var></code></dt>
<dd><a name="index-mconfig_003d"></a>
<p>Selects one of the built-in core configurations.  Each MeP chip has
one or more modules in it; each module has a core CPU and a variety of
coprocessors, optional instructions, and peripherals.  The
<code>MeP-Integrator</code> tool, not part of GCC, provides these
configurations through this option; using this option is the same as
using all the corresponding command-line options.  The default
configuration is &lsquo;<samp>default</samp>&rsquo;.
</p>
</dd>
<dt><code>-mcop</code></dt>
<dd><a name="index-mcop"></a>
<p>Enables the coprocessor instructions.  By default, this is a 32-bit
coprocessor.  Note that the coprocessor is normally enabled via the
<samp>-mconfig=</samp> option.
</p>
</dd>
<dt><code>-mcop32</code></dt>
<dd><a name="index-mcop32"></a>
<p>Enables the 32-bit coprocessor&rsquo;s instructions.
</p>
</dd>
<dt><code>-mcop64</code></dt>
<dd><a name="index-mcop64"></a>
<p>Enables the 64-bit coprocessor&rsquo;s instructions.
</p>
</dd>
<dt><code>-mivc2</code></dt>
<dd><a name="index-mivc2"></a>
<p>Enables IVC2 scheduling.  IVC2 is a 64-bit VLIW coprocessor.
</p>
</dd>
<dt><code>-mdc</code></dt>
<dd><a name="index-mdc"></a>
<p>Causes constant variables to be placed in the <code>.near</code> section.
</p>
</dd>
<dt><code>-mdiv</code></dt>
<dd><a name="index-mdiv-2"></a>
<p>Enables the <code>div</code> and <code>divu</code> instructions.
</p>
</dd>
<dt><code>-meb</code></dt>
<dd><a name="index-meb"></a>
<p>Generate big-endian code.
</p>
</dd>
<dt><code>-mel</code></dt>
<dd><a name="index-mel"></a>
<p>Generate little-endian code.
</p>
</dd>
<dt><code>-mio-volatile</code></dt>
<dd><a name="index-mio_002dvolatile"></a>
<p>Tells the compiler that any variable marked with the <code>io</code>
attribute is to be considered volatile.
</p>
</dd>
<dt><code>-ml</code></dt>
<dd><a name="index-ml"></a>
<p>Causes variables to be assigned to the <code>.far</code> section by default.
</p>
</dd>
<dt><code>-mleadz</code></dt>
<dd><a name="index-mleadz"></a>
<p>Enables the <code>leadz</code> (leading zero) instruction.
</p>
</dd>
<dt><code>-mm</code></dt>
<dd><a name="index-mm"></a>
<p>Causes variables to be assigned to the <code>.near</code> section by default.
</p>
</dd>
<dt><code>-mminmax</code></dt>
<dd><a name="index-mminmax"></a>
<p>Enables the <code>min</code> and <code>max</code> instructions.
</p>
</dd>
<dt><code>-mmult</code></dt>
<dd><a name="index-mmult"></a>
<p>Enables the multiplication and multiply-accumulate instructions.
</p>
</dd>
<dt><code>-mno-opts</code></dt>
<dd><a name="index-mno_002dopts"></a>
<p>Disables all the optional instructions enabled by <samp>-mall-opts</samp>.
</p>
</dd>
<dt><code>-mrepeat</code></dt>
<dd><a name="index-mrepeat"></a>
<p>Enables the <code>repeat</code> and <code>erepeat</code> instructions, used for
low-overhead looping.
</p>
</dd>
<dt><code>-ms</code></dt>
<dd><a name="index-ms-1"></a>
<p>Causes all variables to default to the <code>.tiny</code> section.  Note
that there is a 65536-byte limit to this section.  Accesses to these
variables use the <code>%gp</code> base register.
</p>
</dd>
<dt><code>-msatur</code></dt>
<dd><a name="index-msatur"></a>
<p>Enables the saturation instructions.  Note that the compiler does not
currently generate these itself, but this option is included for
compatibility with other tools, like <code>as</code>.
</p>
</dd>
<dt><code>-msdram</code></dt>
<dd><a name="index-msdram-1"></a>
<p>Link the SDRAM-based runtime instead of the default ROM-based runtime.
</p>
</dd>
<dt><code>-msim</code></dt>
<dd><a name="index-msim-5"></a>
<p>Link the simulator run-time libraries.
</p>
</dd>
<dt><code>-msimnovec</code></dt>
<dd><a name="index-msimnovec"></a>
<p>Link the simulator runtime libraries, excluding built-in support
for reset and exception vectors and tables.
</p>
</dd>
<dt><code>-mtf</code></dt>
<dd><a name="index-mtf"></a>
<p>Causes all functions to default to the <code>.far</code> section.  Without
this option, functions default to the <code>.near</code> section.
</p>
</dd>
<dt><code>-mtiny=<var>n</var></code></dt>
<dd><a name="index-mtiny_003d"></a>
<p>Variables that are <var>n</var> bytes or smaller are allocated to the
<code>.tiny</code> section.  These variables use the <code>$gp</code> base
register.  The default for this option is 4, but note that there&rsquo;s a
65536-byte limit to the <code>.tiny</code> section.
</p>
</dd>
</dl>

<hr>
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